package com.users.filters;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.users.bean.Users;

public class LoginFilter implements Filter{

	public void destroy() {}

	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		HttpServletRequest req = (HttpServletRequest) request;
		HttpServletResponse res = (HttpServletResponse) response;
		Users userinfo = (Users) req.getSession().getAttribute("user");
		// 获取项目名
		String projectName = req.getContextPath();
		if (userinfo != null) {
			chain.doFilter(request, response);
		} else {
			res.sendRedirect(projectName + "/login.jsp");
		}
	}
	public void init(FilterConfig arg0) throws ServletException {}

}
